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No. 353,439, Patented Nov. 30, 1886.

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UNITED STATES GEORGE F. BUTTERS, OF W'EIEELING, HALF TO AROHIBALD W.

PATENT OFFICE.

WEST VIRGINIA, ASSIGNOR OF ONE- PAULL, OF SAME PLACE.

MACHINE FOR DRAWINGSHEET- METAL ARTICLES.

SPECIFICATION forming part of Letters Patent No. 353,439, dated November30, 1886.

Application filed May S 1886. Serial No. 201,514. (No model.)

To all whom, it may concern.-

Be it known that I, GEORGE F. BUTTERs, of WVheeling, in the county ofOhio and State of West Virginia, have invented a new and usefulImprovement in Dies for Drawing Sheet-Metal Articles; and Ido herebydeclare the following to be a full, clear, and exact de scriptionthereof.

My invention in dies for drawing sheet-metal articles has specialreference to carrying into effect the method which forms the subject ofthe joint application No. 186,970, filed by A. W. Paull and myself onDecember 29, 1885, and the methods forming the subjects of three otherapplications of said Paull and myself, filed April 23, 1886, Nos.199,902, 199,903, 199,904.

To enable others skilled in the art to make and use my improvement, Iwill now describe it by reference to the accompanying five sheets ofdrawings, in which Figures 1, 2, and 3 are like views of a set of diesand plunger for performing two draw ings on a blank by a continuousoperation, whereby it is transformed from aflat disk into a deep cup,the three views illustrating the different positions assumed by theparts at different stages of the operation. Figs. 4, 5, and 6 are viewsof the blank in the condition shown in Figs. 1, 2,-and 3. Figs. 7 and 8are sectional views of the same appliances for making a wide-flangedcup. Figs. 9 and 10 show the blank. Figs. 11 and 12 are sectional viewsof the same appliances as used in making double and reflex flanged cups.Figs. 13, 14,15, and 16 are views of the blank.

Like letters of reference indicate like parts in each.

In Figs. 1, 2 and 3, a indicates a die, having a cylindrical centralcavity or matrix, a, the mouth of which is slightly narrower than it isfarther down, for relieving the sides of the article during thesubsequent operation of the machine. Around the mouth of the matrix a isa shallow recess, b, the circular edge of which is formed by the knifeor shear c. The die a is stationary, and is fitted on a suitable frameor bed-plate, as will be understood.

Above the die a is a reciprocating clampingring or holder, d, of suchdiameter as to fit nicely into the recess b, its square outer corneracting with the knife cas a shear, for the purpose of cutting the roughblank e to the requisite circular shape. Inside of the ring d is ahollow plunger, f, the movement of which is heretofore made had aplunger and clampingring, each of which had an independent reciprocatingmovement imparted to it by a separate eccentric on the powenshaft,journaled in the top or head of the machine. In the present machine eachof the three parts d f g has a separate reciprocating movement impartedto it by a separate eccentric, as 1n the ordinary construction.

The operation of this machine is .as follows,

viz: The rough blank of sheet metal 6 is placed on the top of thecircular knife 0, and then the ring (I descends upon it, shearing theedges and forcing the properly shaped blank e (see Fig. 4) down into therecess 1), where it clamps so much of its surface as extends beyond thema- 8o trix a upon the upper face of the die, as shown in Fig. 1. Thehollow plunger then descends on the blank thus held and forces it intothe matrix a, drawing its edge from between the clamping-faces of thedie and ring and forming a cup, e, as shown in Figs. 2 and 5. This cupis carried down in the matrix until its flange passes the contractedpart a of the die and until it is clamped by the hollow plunger f, whichnowacts as a clamping-ring upon the 0 upper end of the second andsmaller die, h, as shown in Fig. 2. The plunger 9 then descends on thecentral unflanged portion of the blank and forces it intothe matrix h,drawing the clamped and flanged portions into the die and 5 forming adeep narrow cup, 6 as shown in Fig. 6. In the second drawing thusdescribed the flange of the cup 6", being in the wider portion of thematrix a, is not clamped, but free,

the only portion of the blank 6 which is clamped 10 In this example thedie it is fastened to 60 being the outer circle of the bottom orunflanged part, which is between the meeting faces of the hollow plungerf and the die h. The consequence is that the clamped and flangedportions will be evenly and smoothly drawn by the plunger 9 from betweenthe clamping-surfaces into the matrix h without buckling or undue strainon the thin cold sheet metal.

In Figs. 7 and 8 I show how these devices are used to make a cup with awide flange. The rough blank e is placed on the cutter c,

v and cut to the proper form by the descent of the ring d, as in Fig. 1.The plungersf and 9 then descend together until a cup with a narrowflange, 6*, is formed, as shown in Figs. 7 and 9. Then the movement ofthe plunger g ceases for the time being, and the plungerfis retracted.At the same time die h rises, and the outer portion of the bottom of thecup, which is beyond the sides of the plunger 9, is clamped between theends of the parts f and h, which continue to rise until their meetin gfaces are in the same horizontal plane of the meeting faces of the die 0and ring 01, as shown in Fig. 8. As the plunger g remains stationaryduring this movement it causes the metal to be drawn between theclamping-faces f and h, and to go to form the sides of the narrow cupand additional width of flange e (Shown in Figs. 8 and 10.)

In Fig. 11, I show how these devices are used to make a double cup. Herethe blank is cut as in Fig. 1. Then the plungers f and g descendtogether until they form a flanged cup such as is shown in Fig. 13, whenthe plunger f encounters the end of the die h. Then the plunger 9remains stationary and the plunger f and die h rise, operating, asdescribed in connection with Figs. 7 and 8, until they form adouble-cupped blank such as is shown in Figs. 11 and 14.

In Fig. 12 I show how to make a reflexflanged cup. Here the blank is outas in Fig. 1, and a flanged cup such as is shown in Fig. 15 is made bythe joint downward movement of the plungersf and 9. Then the partsf andit rise together, drawing the metal into a smaller cup over the plungerg, and also when they rise above the plane of the clamping-faces of thedie a and ring (I, drawing'the flange e from between the clamping ringand die, and bending it reversely. During this action the plunger 9 alsorises, but more slowly than the other parts. The result is a blank witha reverse flange, e as shown in Fig. 16.

In Fig. 12 I show the clamping-ring d as con nected with the plunger fby rods 2', and pro vided with springs 70, so that one set ofconnecting-rods m, with their yokes and eccentrics, will serve tooperate both. The springs hold the ring d in advance of the plunger, sothat it comes down on and clamps the blank before the plunger begins toact thereon,which it is able to do by reason of the compressibility ofthe springs, as will be understood. The shear 0 may of course be omittedand the blanks cut to shape by other means.

The cup-shaped blanks which are produced by my improved dies are usedfor various purposessuch as for lantern fittings, pans, &c. beingfinished by other operations and tools.

The object of my improvement is the reduction of the cost ot'manufactnre by a saving of time and labor, which is accomplished by theuse of my invention.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, in a machine for drawing sheet metal, of a diehaving a cylindrical matrix, a clamping-ring acting in conjunction withthe face of the die, a second die situate in the first die, a hollowplunger working into the first die and against the face of the seconddie, and a plunger working through the hollow plunger and into thesecond die, substantially as and for the pn rposes described.

2. The combination, in a machine for drawing sheet metal, of a diehaving a cylindrical matrix the mouth of which is slightly narrowed, asecond die situate in the wider part of the matrix of the first dic ahollow plunger working through the narrow mouth of the first die andagainst the face of the second die,

step on the blank, and the plungers f, g, and

h completing the formation of the article, substantially as and for thepurposes described.

In testimony whereof I have hereunto set my hand this 25th day ofFebruary, A. D. 1886.

GEORGE F. BUTTERS.

W'itnesses:

W. B. CoRwIN, THOMAS B. KERR.

